They have free satoshis that you can get from the box at the upper portion of the site. Is that not enough to use to test their games? Or you need huge play money to feel the game?
Slots are usually more expensive and i don't have time to drain faucet for days. I suppose i can use it for some games. But i might just use my btc on them. And i've been interested to try out their live casino games on their site. Especially now with corora lockdowns it would be fun to have that live gambling feeling.